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JavaScript Synchronization

I'm playing with a small sliding tile puzzle, and I'm having a lot of problems implementing the shuffle algorithm. The implementation is far from polished, but I can't seem to figure out what is going wrong. The page can be found at:http://www.owlnet.rice.edu/~gmalecha...ding_tile.html

If you click the Shuffle link, you will immediately see what the problem is. The direct link to the JavaScript can be found at: